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Date: Mon, 14 Sep 2009 16:43:48 -0400
From: Josh Boyer <jwboyer@linux.vnet.ibm.com>
To: Maynard Johnson <maynardj@us.ibm.com>
Subject: Re: [PATCH] powerpc: Fix bug where perf_counters breaks oprofile
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Cc: Paul Mackerras <paulus@samba.org>,
	Benjamin Herrenschmidt <benh@au1.ibm.com>,
	Maynard Johnson <mpjohn@us.ibm.com>, linuxppc-dev@ozlabs.org
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On Mon, Sep 14, 2009 at 03:14:02PM -0500, Maynard Johnson wrote:
>Maynard Johnson wrote:
>> Paul Mackerras wrote:
>>> Currently there is a bug where if you use oprofile on a pSeries
>>> machine, then use perf_counters, then use oprofile again, oprofile
>>> will not work correctly; it will lose the PMU configuration the next
>>> time the hypervisor does a partition context switch, and thereafter
>>> won't count anything.
>Ben,
>Is there any way to get this bug fix into 2.6.31 or is the window closed?  Once the problem occurs, you can't get oprofile to work again without a reboot.  Really would be nice (for many reasons) to get this fixed in .31.

.31 is already released.  Could probably get it into a -stable .31 kernel
though.

josh